[Bug 1862167] [NEW] Variation of SVE register size (qemu-user-aarch64)

[Bug 1862167] [NEW] Variation of SVE register size (qemu-user-aarch64)

[Kentaro Kawakami]

Public bug reported:

Specification of ARMv8-A SVE extention allows various values ​​for the
size of the SVE register. On the other hand, it seems that the current
qemu-aarch64 supports only the maximum length of 2048 bits as the SVE
register size. I am writing an assembler program for a CPU that is
compliant with ARMv8-A + SVE and has a 512-bit SVE register, but when
this is run with qemu-user-aarch64, a 2048-bit load / store instruction
is executed This causes a segmentation fault. Shouldn't qeum-user-
aarch64 have an option to specify the SVE register size?

** Affects: qemu
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1862167

Title:
  Variation of SVE register size (qemu-user-aarch64)

Status in QEMU:
  New

Bug description:
  Specification of ARMv8-A SVE extention allows various values ​​for the
  size of the SVE register. On the other hand, it seems that the current
  qemu-aarch64 supports only the maximum length of 2048 bits as the SVE
  register size. I am writing an assembler program for a CPU that is
  compliant with ARMv8-A + SVE and has a 512-bit SVE register, but when
  this is run with qemu-user-aarch64, a 2048-bit load / store
  instruction is executed This causes a segmentation fault. Shouldn't
  qeum-user-aarch64 have an option to specify the SVE register size?

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1862167/+subscriptions

[Bug 1862167] Re: Variation of SVE register size (qemu-user-aarch64)

[Laurent Vivier]

This is already managed by a cpu property.

0df9142d27d5 ("target/arm/cpu64: max cpu: Introduce sve<N> properties")

See docs/arm-cpu-features.rst

Try "-cpu max,sve512=on".

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1862167

Title:
  Variation of SVE register size (qemu-user-aarch64)

Status in QEMU:
  New

Bug description:
  Specification of ARMv8-A SVE extention allows various values ​​for the
  size of the SVE register. On the other hand, it seems that the current
  qemu-aarch64 supports only the maximum length of 2048 bits as the SVE
  register size. I am writing an assembler program for a CPU that is
  compliant with ARMv8-A + SVE and has a 512-bit SVE register, but when
  this is run with qemu-user-aarch64, a 2048-bit load / store
  instruction is executed This causes a segmentation fault. Shouldn't
  qeum-user-aarch64 have an option to specify the SVE register size?

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1862167/+subscriptions

[Bug 1862167] Re: Variation of SVE register size (qemu-user-aarch64)

[Peter Maydell]

Note also that the vector length in SVE is not fixed -- you should be
writing your guest code to support arbitrary vector lengths, because
otherwise it will not run on all SVE-supporting CPUs.

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1862167

Title:
  Variation of SVE register size (qemu-user-aarch64)

Status in QEMU:
  New

Bug description:
  Specification of ARMv8-A SVE extention allows various values ​​for the
  size of the SVE register. On the other hand, it seems that the current
  qemu-aarch64 supports only the maximum length of 2048 bits as the SVE
  register size. I am writing an assembler program for a CPU that is
  compliant with ARMv8-A + SVE and has a 512-bit SVE register, but when
  this is run with qemu-user-aarch64, a 2048-bit load / store
  instruction is executed This causes a segmentation fault. Shouldn't
  qeum-user-aarch64 have an option to specify the SVE register size?

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1862167/+subscriptions

[Bug 1862167] Re: Variation of SVE register size (qemu-user-aarch64)

[Alex Bennée]

** Tags added: arm

** Changed in: qemu
       Status: New => Invalid

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1862167

Title:
  Variation of SVE register size (qemu-user-aarch64)

Status in QEMU:
  Invalid

Bug description:
  Specification of ARMv8-A SVE extention allows various values ​​for the
  size of the SVE register. On the other hand, it seems that the current
  qemu-aarch64 supports only the maximum length of 2048 bits as the SVE
  register size. I am writing an assembler program for a CPU that is
  compliant with ARMv8-A + SVE and has a 512-bit SVE register, but when
  this is run with qemu-user-aarch64, a 2048-bit load / store
  instruction is executed This causes a segmentation fault. Shouldn't
  qeum-user-aarch64 have an option to specify the SVE register size?

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1862167/+subscriptions

[Bug 1862167] Re: Variation of SVE register size (qemu-user-aarch64)

[Kentaro Kawakami]

Thank you for your kind advice. I'll try it.

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1862167

Title:
  Variation of SVE register size (qemu-user-aarch64)

Status in QEMU:
  Invalid

Bug description:
  Specification of ARMv8-A SVE extention allows various values ​​for the
  size of the SVE register. On the other hand, it seems that the current
  qemu-aarch64 supports only the maximum length of 2048 bits as the SVE
  register size. I am writing an assembler program for a CPU that is
  compliant with ARMv8-A + SVE and has a 512-bit SVE register, but when
  this is run with qemu-user-aarch64, a 2048-bit load / store
  instruction is executed This causes a segmentation fault. Shouldn't
  qeum-user-aarch64 have an option to specify the SVE register size?

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1862167/+subscriptions